[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.340452] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.050931] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.265797] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.065016] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) [ 32.823199] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) Warning: Permanently added '10.128.15.204' (ECDSA) to the list of known hosts. [ 38.193219] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 40.237679] random: nonblocking pool is initialized [ 40.243990] kasan: CONFIG_KASAN_INLINE enabled [ 40.248422] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 40.261251] Dumping ftrace buffer: [ 40.264757] (ftrace buffer empty) [ 40.268432] Modules linked in: [ 40.271704] CPU: 1 PID: 3333 Comm: syzkaller475370 Not tainted 4.4.111-g3301b55 #24 [ 40.279461] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.288782] task: ffff8801d0802f80 task.stack: ffff8801d01a0000 [ 40.294807] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 40.303044] RSP: 0018:ffff8801d01a79f0 EFLAGS: 00010a07 [ 40.308457] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9ebb [ 40.315695] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 40.322934] RBP: ffff8801d01a7a00 R08: 0000000000000001 R09: 0000000000000001 [ 40.330173] R10: 0000000000000000 R11: 1ffff1003a034f1c R12: 0000000000000004 [ 40.337433] R13: 0000000000000020 R14: ffff8800b0eb8000 R15: dffffc0000000000 [ 40.344691] FS: 0000000001b1e880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 40.352889] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.358738] CR2: 0000000020dc8000 CR3: 00000001d00ae000 CR4: 0000000000160670 [ 40.365978] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.373248] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.380510] Stack: [ 40.382654] ffffffff837764a9 ffff8800b0eb8158 ffff8801d01a7a60 ffffffff825b9ee1 [ 40.390644] ffff8800b0eb8170 ffffed00161d702b ffffed00161d702e ffff8800b0eb8168 [ 40.398619] dead4ead00000000 ffff8800b0eb8140 0000000000000000 0000000000000000 [ 40.406574] Call Trace: [ 40.409137] [] ? retint_kernel+0x2d/0x2d [ 40.414829] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 40.421292] [] sg_finish_rem_req+0x2b5/0x340 [ 40.427322] [] sg_new_read.isra.18+0x336/0x3c0 [ 40.433522] [] sg_read+0x8c2/0x1490 [ 40.438772] [] ? __check_object_size+0x154/0x35b [ 40.445149] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 40.451786] [] ? fsnotify+0xee0/0xee0 [ 40.457207] [] ? avc_policy_seqno+0x9/0x20 [ 40.463062] [] do_loop_readv_writev+0x141/0x1e0 [ 40.469348] [] ? security_file_permission+0x89/0x1e0 [ 40.476087] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 40.482725] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 40.489363] [] do_readv_writev+0x5dd/0x6e0 [ 40.495217] [] ? vfs_write+0x530/0x530 [ 40.500725] [] ? _raw_spin_unlock+0x2c/0x50 [ 40.506705] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 40.513707] [] ? handle_mm_fault+0x3f2/0x3190 [ 40.519827] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 40.526641] [] ? __fsnotify_parent+0xbc/0x340 [ 40.532762] [] ? avc_policy_seqno+0x9/0x20 [ 40.538883] [] ? fsnotify+0x5ad/0xee0 [ 40.544308] [] vfs_readv+0x78/0xb0 [ 40.549468] [] SyS_readv+0xd9/0x240 [ 40.554716] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 40.561266] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 40.567817] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 40.574360] Code: 96 a4 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 40.600769] RIP [] __free_pages+0x21/0x90 [ 40.606650] RSP [ 40.611807] ---[ end trace f9ab84c318540c0e ]--- [ 40.616569] Kernel panic - not syncing: Fatal exception [ 40.622423] Dumping ftrace buffer: [ 40.625942] (ftrace buffer empty) [ 40.629622] Kernel Offset: disabled [ 40.633214] Rebooting in 86400 seconds..